Crossword Genius

Did he sound young to be a captain? (4)

Ross

I believe the answer is:

kidd

I'm a little stuck... Click here to teach me more about this clue!

'he sound young to be a captain?' is the definition.
The definition suggests a singular noun which matches the answer.

'did' is the wordplay.
I cannot really understand how this works, but
an anagram of 'did' is 'idd' which is within the answer.
A single letter 'k' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for kidd that I've seen before include "Captain --, Scots pirate" , "Captain William -, Scottish pirate" .)

I've seen this clue in the Evening Standard.
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